Prevent clobbering custom `this.options.babel`
Prevent clobbering custom `this.options.babel`

Setting `this.options` inside of `included` to the options from
`lib/broccoli/ember-app` means that we will attempt to transpile
with the `options.babel` that the host app / addon is using.
Which, as of, 2.13+ that will be babel@6 and therefore incompatible
options with ember-cli-babel@5 (which this addon uses).
ember-cli/ember-cli-mocha,switchfly/ember-cli-mocha,ember-cli/ember-cli-mocha,switchfly/ember-cli-mocha